[1/2(x-y)]³×[2(y-x)]²×[－2/3(y-x)]²=1/8(x-y)³×[4(x-y)²]×[4/9(x-y)²]=1/8×4×(4/9)×(x-y)^(3+22)=2/9(x-y)^7 【中学生数理化】团队为您答题,祝你学习进步!有不明白的可以追...